Fema SK 20 Bedienungsanleitung Seite 3

Product
Group
Technical Data
Output signal
0...10 V sink current ± 1 mA
Operating voltage
24 V AC ± 20 % or 24 V...36 V DC
Power consumption
Max. 1 W
Pressure connection
5 x 11 mm, for flexible hose dia i = 5 mm
Protection class
IP 65
Cable entry
Plug connection ST 7, with cable entry size
PG 11, with transparent lid which can be
opened for easy installation and start-up.
Measuring the output signal is possible
without opening the transmitter housing.
Materials
Parts in contact with measured medium:
epoxy resin, polyester, silicone rubber,
aluminium.
Housing: Makrolon.
Maximum pressure
20 kPa
Medium temperature
–10...+70 °C
Humidity
Max. 95 % r.H. Condensation in the sensor
may lead to damage.
Ambient temperature
0...50 °C
ZERO-Offset
With potentiometer, if needed
Connection diagram
Accessories
Included in delivery:
– Plug connection ST 7
– Mounting bracket H 11,
including 2 screws
– Accessory kit SK-K consisting of
2 m of silicone hose, 2 joining pipes
with extensions and 4 screws
– 1 spare jumper
Optional accessories:
– LCD-display (in Pa) AK-SK integrated
in housing lid
– Plug-in bracket H 12 for mounting
on DIN rail, e.g. in cabinet
– Limit value switches APV...
Differential pressure transmitter, piezoresistive
for air conditioning/ventilation – with 4 selectable working ranges
SK
Features
•
4 working ranges selectable by
jumpers (SK 5, SK 10, SK 20)
•
ZERO-Offset by potentiometer
•
Joining pipes, silicone hose and
mounting material included in delivery
•
Plug can be opened for easy
installation and commissioning
•
Inversion
•
Short circuit
•
Optional with LCD-display
Product description and applications
Differential pressure transmitter in 3-wire technology, with an output signal of 0–10 V (± 1 mA),
for air conditioning and other ventilation applications, e.g. for filter monitoring, pressure or flow
control, max. pressure control etc.
The transmitter can be used for gauge pressure (pressure connection to +), for vacuum (pressure
connection to –) and for differential pressure (high pressure to +, low pressure to –).
Installation and accessories
The transmitter can be installed on a vertical surface, e.g. on the wall of the air handling unit or
on the air duct with the mounting bracket H 11 included in scope of delivery. The joining pipes
with extensions, 2 m of silicone hose and all screws needed for mounting the transmitter and
accessories are also included.
Selection of other preconfigured working ranges
In addition to the nominal range other working ranges can be selected by a jumper after removing
the housing lid (exception SKV types).
Type summary
Nominal range
Pa
0...
0...
0...
–500...
–1000... +1000
LCD-display (when ordered separately)
Plug-in bracket for mounting on DIN rail
* SK 5 is technically identical with SK 10, but the product will be delivered with the frequently
used jumper setting 0–500 Pa ex-factory. This avoids changing the jumper when 0–500 Pa is
needed.
Mounting bracket
H 11
Warning: Use only the silicone hose which is included in delivery, less
soft hoses may lead to damage of the sensor!
Fema Controls
Honeywell AG • P.O. Box 1254 • D-71099 Schönaich
Phone 0 70 31 / 637-02 • Fax 0 70 31 / 637-850
Working ranges
Selectable by jumpers
Pa
1000 0...1000/500/200/100
500 0...1000/500/200/100
2000 0...2000/1000/400/200
+500 –
–
Joining pipe with
Extension DPSJ
Type Type
with display without display
SK 10-AK SK 10
SK 5-AK SK 5*
SK 20-AK SK 20
SKV 5-AK SKV 5
SKV 10-AK SKV 10
AK-SK
H 12
Mounting on DIN rail,
e.g. in cabinet, with plug in
bracket H 12
7157 229e / 7